My o.s. drive keeps running low on space even after I give it more. I have XP on a 2gig drive, that run out of space so I gave it 500meg more. Then about a month later I am running out of space again on that drive. I don’t store or load anything on this drive, I clean up all my temp folders, however I keep running out of space. What is causing this problem and how may I solve it?